Closed injuries of the elbow joint with intra-articular fractures are common in the practice of a traumatologist. However, targeted studies depending on the time periods, that is, on the timing of injury and developing structural changes in the joint capsule and synovial membranes among children's patients is still an insufficiently studied problem. Such studies can reveal all sorts of structural deviations, timely diagnosis and treatment of which can prevent serious consequences, including contractures and ankylosis in the elbow joint.